用函数修改全局变量？ [英] Modify a Global Variable with a Function?

问题描述

在mousePressed中，我需要aNumber的值，但是我无法传递mousePressed（int aNumber）..所以我需要某种全局的方式来在数字通过javascript调用时保持修改状态。

In mousePressed, I need the value of aNumber, but I can't pass mousePressed(int aNumber).. so I need some sort of global to remain modified when theNumbers is called via javascript..

int number = 0;
int theNumbers(int aNumber) { //aNumber = 1, 2, or 3, from the javascript)

  println(number); // prints the correct number
  int number = aNumber; // set the global variable number equal to aNumber 
  return number;
}

void mousePressed() {
  aLongNumber = 10000000000;

  println(number); // prints 0 right now, should print the value of aNumber
  long numberLong = aLongNumber + (number * aLongNumber);
}

推荐答案

您正在声明局部变量 theNumbers（）只需在数字之前删除 int 看起来像这样：

You are declaring local variable inside theNumbers() just remove int before number so your function would look like this:

int theNumbers(int aNumber) { //aNumber = 1, 2, or 3, from the javascript)

  println(number);
  number = aNumber; // removed int that made new local variable "number"
  return number;
}

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